10 Ancient Unsolved Mysteries

This is a very cool list of ancient mysteries. Follow the link to LiveScience.

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Disappearance of the Indus Valley Civilization
With a culture that stretched from western India to Afghanistan and numbering over 5 million, the ancient Indus Valley people-India’s oldest known civilization-were apparently an impressive and sanitary bronze-age bunch. The scale of their baffling and abrupt collapse rivals that the great Mayan decline. It wasn’t until 1922 that Sir John Marshall excavated the remains of a hygienically-advanced culture with a highly sophisticated sewage drainage system and immaculately constructed baths. Strangely, there is no archaeological evidence of armies, kings, slaves, social conflicts, or vices prevalent in ancient societies. Even to the very end, it seems, they kept it clean.